He also played five years in the Canadian Football League (CFL) for the Hamilton Tiger-Cats (1950–1951) and Toronto Argonauts (1952–1954).

"[6] In January 1947, Carpenter announced that he intended to withdraw from school at the end of the semester to play professional football.

He initially signed with the New York Yankees, but was traded to the Cleveland Browns and then in late August 1947 to the Buffalo Bills.

[9] The AAFC folded after the 1949 season, and Carpenter signed to play for the Hamilton Tiger-Cats of the Canadian Football League in 1950.

[10] His signing led one Canadian sports columnist to write: "The advance notices indicate that local football fans will see a real lineman when Jack Carpenter shows here with the Tiger-Cats on Saturday.